A use case describes how a user uses a system to accomplish a particular goal. (use cases), thus, use cases help ensure that the correct system is developed by capturing the requirements from the user's point of view.
A use case diagram consists of the system, the related use cases and actors and relates these to each other to visualize: what is being described? A use case is a list of actions or event steps typically defining the interactions between a role of an actor and a system to achieve a goal.
Use cases are typically initiated by a user to fulfill goals describing the activities and variants involved in attaining the goal.
The relationships between and among the actors and the use cases.
While a use case itself might drill into a lot of detail (such as, flow of events and scenarios) about every possibility, a use-case diagram can help provide a higher-level view of the system, providing the simplified and graphical representation of what the system must actually do.
A use case (or set of use cases) has these characteristics: Actors are usually individuals involved with the system defined according to their roles. A use case describes how actors uses a system to accomplish a particular goal.The title of an abstract use case is shown in italics.Example This example depicts a model of several business use cases (goals) which represents the interactions between a restaurant (the business system) and its primary actors.An extending use case is, effectively, an alternate course of the base use case.The use case accomplishes this by conceptually inserting additional action sequences into the base use-case sequence. It can not be instantiated, as it contains incomplete information.Create a professional diagram for nearly any use case using our UML diagram tool.In the Unified Modeling Language (UML), a use case diagram can summarize the details of your system's users (also known as actors) and their interactions with the system. Make your own flashcards that can be shared with others.Learn with extra-efficient algorithm, developed by our team, to save your time.UML use case diagrams are ideal for: This use case diagram is a visual representation of the process required to write and publish a book.Whether you’re an author, an agent, or a bookseller, inserting this diagram into your use case scenario can help your team publish the next big hit. You can adapt this template for any process where a customer purchases a service.